Each spinal nerve in a mammal arises from the spinal cord by two roots, a dorsal and a ventral. Of these, the ventral root is composed of

Somatic motor and visceral motor fibres

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Somatic sensory and visceral motor fibres

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Somatic motor and visceral sensory fibres

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Somatic sensory and visceral sensory fibres

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Solution

The correct option is A Somatic motor and visceral motor fibres
The ventral root (motor root) of each spinal nerve consists of axons, from motor neurons, whose cell bodies are found within the gray matter of the spinal cord.

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Similar questions

One of the following gives the correct sequence of the components in a reflex arc. This is :

(a) Receptors $\to$ Muscle $\to$ Sensory neuron $\to$ Motor neuron $\to$ Spinal cord

(b) Receptors $\to$ Motor neuron $\to$ Spinal cord $\to$ Sensory neuron $\to$ Muscle

(d) Receptors $\to$ Sensory neuron $\to$ Spinal cord $\to$ Motor neuron $\to$ Muscle

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